Class: Marcdouane::Rules::SingleTopLevelHeader

Inherits:
Rule
  • Object
show all
Defined in:
lib/marcdouane/rules/single_top_level_header.rb

Overview

Ensure that there is only a single top-level header in the file.

Constant Summary collapse

ERROR_MESSAGE = 
"A top-level header is already present"

Instance Attribute Summary

Attributes inherited from Rule

#file, #markdown, #options

Instance Method Summary collapse

Methods inherited from Rule

#error!, #identifier, #initialize, #line_number_from_byte_range

Constructor Details

This class inherits a constructor from Marcdouane::Rules::Rule

Instance Method Details

#check! ⇒ Object 



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# File 'lib/marcdouane/rules/single_top_level_header.rb', line 9

def check!
  previously_seen = false

  @markdown.on(:heading) do |header|
    if header.level == 1
      if previously_seen
        error!(line_number_from_byte_range(header.byte_range))
      else
        previously_seen = true
      end
    end
  end

  @markdown.walk
end